Iridium Ix Spark Plug (LFR6AIX-11)
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NGK Iridium Ix Spark Plug (LFR6AIX-11)

Part No. 6619 Warranty Details  

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Laser-welded iridium center electrode; extremely resistant to heat, corrosion, and electrical wear; tapered ground electrode minimizes quenching; outstanding acceleration; high fuel efficiency and durability.

Product Features:
  • 0.6mm iridium-tip center electrode provides durability six times harder than platinum and a higher melting point
  • Taper-cut ground electrode shape provides improved flame reproduction
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Center Electrode Core Material:Copper Core
Center Electrode Tip Material:Iridium
Electrode Core Material:Iridium
Electrode Tip Material:Iridium
Gap Size:0.044 in
Ground Configuration:Standard
Ground Electrode Core Material:Nickel Core
Ground Electrode Quantity:1
Ground Electrode Tip Design:Taper Cut
Ground Strap Quantity:1
Hex Size:5/8
Manufacturer Heat Range:6
Reach:26.5 mm
Resistor:Yes
Seat Type:Gasket
Shorty Spark Plug:No
Thread Diameter:14 mm
Tip Configuration:Solid
Type:Iridium IX
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
NGKIridium Ix Spark Plug (LFR6AIX-11)
 
4.2

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

88%

of respondents would recommend this to a friend.

Pros

  • Easy to install (5)
  • Improves engine efficiency (4)

Cons

No Cons

Best Uses

  • Everyday driving (3)
    • Reviewer Profile:
    • Auto enthusiast (3)

Most Liked Positive Review

 

Great for the price

This plug is worth every penny. I used them in my 2009 BMW 328I. Great performance ...smooth idle andimprove my gas miles. Hard to beat for less than 10 dollars each sams...Read complete review

This plug is worth every penny. I used them in my 2009 BMW 328I. Great performance ...smooth idle andimprove my gas miles. Hard to beat for less than 10 dollars each sams as OEM but 10 dollars cheaper

VS

Most Liked Negative Review

 

Gap not factory spec

There is lots of disagreement on if this is truly the correct replacement plug for the sti. It is not. The gap is too big.

There is lots of disagreement on if this is truly the correct replacement plug for the sti. It is not. The gap is too big.

Reviewed by 10 customers

Displaying reviews 1-10

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5.0

Perect fit

By 

from Pittsburgh PA

See all my reviews

Verified Buyer
3 or more reviews submitted

Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

Great plug. Stick with NKG if you own Subaru

  • Was this a gift?:
  • No

Comment on this reviewHelp Icon

 
5.0

So far so good

By 

from Va

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

East to install

  • Was this a gift?:
  • No

Comment on this reviewHelp Icon

 
5.0

NGK PLUGS the only way to go.

By 

from Albany NY

Verified Buyer

Pros

  • Well made

Cons

    Best Uses

      Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

      If you're going to invest the time to replace spark plugs you should get the best parts possible.

      Comment on this reviewHelp Icon

      (3 of 3 customers found this review helpful)

       
      5.0

      Great for the price

      By 

      from SAN ANTONIO

      About Me Mechanic

      Pros

      • Easy To Install
      • Good Value
      • Improves Engine Efficiency
      • Increases Power

      Cons

        Best Uses

        • Everyday Driving

        Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

        This plug is worth every penny. I used them in my 2009 BMW 328I. Great performance ...smooth idle andimprove my gas miles. Hard to beat for less than 10 dollars each sams as OEM but 10 dollars cheaper

        Comment on this reviewHelp Icon

        (1 of 2 customers found this review helpful)

         
        4.0

        Good plugso

        By 

        from Louisville,ky

        Verified Buyer

        Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

        Cost of factory plugs for s55 amg was 347$. These were less and perform as good as factory.

        Comment on this reviewHelp Icon

        (0 of 10 customers found this review helpful)

         
        1.0

        Service bad, spark plug good

        By 

        from New Orleans

        Verified Buyer

        Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

        The spark plugs I bought were ok but the service was terrible. I went online to buy them and had to select a store 10 miles out of the way and when I got there they only had 4 of the 6 plugs I ordered. Then I had to go to another store to get the other two.

        Bad customer service! Not going back to advance auto!

        Comment on this reviewHelp Icon

         
        5.0

        Great service, part ready on time

        By 

        from solon springs,wi

        About Me Truck Enthusiast

        Verified Buyer

        Pros

        • Easy To Install
        • Improves Engine Efficiency

        Cons

          Best Uses

          • Replacement

          Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

          Exact replacement, great price,

          Comment on this reviewHelp Icon

          (1 of 1 customers found this review helpful)

           
          5.0

          Used on 2006 330i

          By 

          from socal

          About Me Auto Enthusiast

          See all my reviews

          Verified Buyer
          3 or more reviews submitted

          Pros

          • Easy To Install
          • Improves Engine Efficiency

          Cons

            Best Uses

              Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

              Works the same as OE at a fraction of the price.

              Comment on this reviewHelp Icon

              (1 of 5 customers found this review helpful)

               
              2.0

              Gap not factory spec

              By 

              from Green Bay WI

              About Me Auto Enthusiast

              Verified Buyer

              Pros

              • Easy To Install

              Cons

                Best Uses

                • Everyday Driving
                • Performance Driving
                • Racing

                Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

                There is lots of disagreement on if this is truly the correct replacement plug for the sti. It is not. The gap is too big.

                Comment on this reviewHelp Icon

                (1 of 2 customers found this review helpful)

                 
                5.0

                One of the best you can get

                By 

                from Odessa, TX

                About Me Auto Enthusiast

                See all my reviews

                Ask me a question

                Pros

                • Easy To Install
                • High Quality
                • Improves Engine Efficiency
                • Increases Power
                • Oem Quality Or Better

                Cons

                  Best Uses

                  • Everyday Driving
                  • Performance Driving
                  • Racing
                  • Replacement
                  • Restoration

                  Comments about NGK Iridium Ix Spark Plug (LFR6AIX-11):

                  I used these plugs as a replacement for the original equipment ones in my 2010 Subaru Impreza Sti. They come highly recommended by many online performance blogs. So far they perform just as well, if not more efficiently than the originals. Just be sure to check your gapping on the plugs. I had to change all of mine.

                  Comment on this reviewHelp Icon

                  Displaying reviews 1-10

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                  Do you have questions about this product?

                   

                  Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

                  2 Questions | 4 Answers
                  Displaying questions 1-2
                  • Q:

                    do you have this plug thats pregaped to .040-.044 I need it for a custom application.
                    Asked on 10/7/2012 by D

                    2 answers

                    • A:

                      This particular plug is pregapped to .044 from the factory.

                      Answered on 8/15/2015 by animal99 from NYC, NY
                    • CUSTOMER CARE

                      A:

                      For further assistance regarding the NGK Iridium Ix Spark Plug (LFR6AIX-11) (Part No. 6619), please provide the year, make, model and engine size of your vehicle. You can also call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have.

                      Answered on 10/7/2012 by Rick from AAP
                  • Q:

                    what are these gaped at?
                    Asked on 10/7/2012 by D

                    2 answers

                    • A:

                      This particular plug is pregapped to .043 from the factory but may be .044 in some cases. You should check their gap before installing.

                      Answered on 8/15/2015 by animal99 from NYC, NY
                    • CUSTOMER CARE

                      A:

                      The spark plug gap of the NGK Iridium Ix Spark Plug (LFR6AIX-11) (Part No. 6619) should vary with the vehicle. In order to find the spark plug gap, please provide the year, make, model and engine size of your vehicle. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have.

                      Answered on 10/7/2012 by Rick from AAP
                  Displaying questions 1-2

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